From owner-freebsd-current@FreeBSD.ORG  Tue Dec  6 05:19:25 2011
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id E7E321065670
	for <freebsd-current@freebsd.org>; Tue,  6 Dec 2011 05:19:25 +0000 (UTC)
	(envelope-from lacombar@gmail.com)
Received: from mail-fx0-f54.google.com (mail-fx0-f54.google.com
	[209.85.161.54])
	by mx1.freebsd.org (Postfix) with ESMTP id 7C4B48FC14
	for <freebsd-current@freebsd.org>; Tue,  6 Dec 2011 05:19:25 +0000 (UTC)
Received: by faak28 with SMTP id k28so5435076faa.13
	for <freebsd-current@freebsd.org>; Mon, 05 Dec 2011 21:19:24 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma;
	h=mime-version:in-reply-to:references:date:message-id:subject:from:to
	:content-type; bh=5udT9Ty9WkYb0rNnmrTTi1dp2hOG4epUSlvhdtRlmag=;
	b=iYQEHjPkq0qqnyJQsZqejES6J+bYeN7mhfo9PfB4oiMOMJCybe0dpo/8zGcDFF/tPF
	cpkrI43ApRNY8NhXGdAqMXquNdj7Zmlq29vznA3DOqzXhJjkdxqOtDnK+6w+lTrbKzCy
	lTgu+vztspGtp5DSgaEretQwmVztDH6yezpbU=
MIME-Version: 1.0
Received: by 10.227.59.203 with SMTP id m11mr10114275wbh.18.1323148764207;
	Mon, 05 Dec 2011 21:19:24 -0800 (PST)
Received: by 10.180.94.2 with HTTP; Mon, 5 Dec 2011 21:19:24 -0800 (PST)
In-Reply-To: <CACqU3MWVZBqC=a=kugiQwstTgrAcHMY+MkycVN2oEYXi1Qpw9w@mail.gmail.com>
References: <CACqU3MUTY4-+RXxMSSdi1t677sk4szzXLgGF9AKXGTJNby6b-g@mail.gmail.com>
	<CACqU3MWVZBqC=a=kugiQwstTgrAcHMY+MkycVN2oEYXi1Qpw9w@mail.gmail.com>
Date: Tue, 6 Dec 2011 00:19:24 -0500
Message-ID: <CACqU3MWRygmz=_pi0=khEP+mmE1xkbRZkEnKo2aJBp5njcq8eg@mail.gmail.com>
From: Arnaud Lacombe <lacombar@gmail.com>
To: FreeBSD-Current <freebsd-current@freebsd.org>
Content-Type: text/plain; charset=ISO-8859-1
Subject: Re: PAE broken on -current, likely broken on stable/9
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 06 Dec 2011 05:19:26 -0000

Hi,

On Mon, Dec 5, 2011 at 11:12 PM, Arnaud Lacombe <lacombar@gmail.com> wrote:
> On Mon, Dec 5, 2011 at 5:15 PM, Arnaud Lacombe <lacombar@gmail.com> wrote:
>> Hi,
>>
>> The kernel tree is utterly broken when PAE is enabled, it chokes
>> [non-exclusively] on the following:
>>
> After finally having been able to complete a build, the resulting
> kernel miserably panics on:
>
> real memory: 25769803776 (24576 MB)
> panic: kmem_suballoc: bad status return of 3
>
Just for the fun, after having fought for 8h for nearly nothing with
FreeBSD, I thought it would be fair to give it a try with Linux, say
the latest -rc, that is 3.2-rc3, with a snapshot of the upcoming
openwrt. The result:

root@OpenWrt:/# free
             total       used       free     shared    buffers
Mem:      16628216      14864   16613352          0        236
-/+ buffers:            14628   16613588
Swap:            0          0          0

total time spent to get to userland: about 30 min.

too easy... Let's give it a try with a system with 32GB of RAM:

root@OpenWrt:/# free
             total       used       free     shared    buffers
Mem:      33274356      17124   33257232          0        252
-/+ buffers:            16872   33257484
Swap:            0          0          0

d'oh!

ok, I'm not entirely honest, tmpfs chocked:

tmpfs: Bad value '1.70365e+10' for mount option 'size'.

Let's give it a try with 60GB now:

root@OpenWrt:/# free
             total       used       free     shared    buffers
Mem:      62405104      17116   62387988          0        256
-/+ buffers:            16860   62388244
Swap:            0          0          0

damn... Linux' no fun... :-(

 - Arnaud

ps: the kernel actually panic with the full 64GB of RAM, while
mounting the filesystem.